package com.changyi.device.printer;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.view.Gravity;
import android.view.View.MeasureSpec;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;


/** 
*
* 	生成条形码和二维码的工具
*/
public class ZXingUtils {

/**
* Bitmap
* 
* @param contents
*            生成的内容
* @param format
*            编码格式
* @param desiredWidth
* @param desiredHeight
* @return
* @throws WriterException
*/
protected static Bitmap encodeAsBitmap(String contents,
BarcodeFormat format, int desiredWidth, int desiredHeight) {
	final int WHITE = 0xFFFFFFFF;
	final int BLACK = 0xFF000000;
	
	MultiFormatWriter writer = new MultiFormatWriter();
	BitMatrix result = null;
	try {
		result = writer.encode(contents, format, desiredWidth,
		desiredHeight, null);
	} catch (WriterException e) {
		e.printStackTrace();
	}
	
	int width = result.getWidth();
	int height = result.getHeight();
	int[] pixels = new int[width * height];
	// All are 0, or black, by default
	for (int y = 0; y < height; y++) {
		int offset = y * width;
		for (int x = 0; x < width; x++) {
			pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
		}
	}

	Bitmap bitmap = Bitmap.createBitmap(width, height,
	Config.ARGB_8888);
	bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
	return bitmap;
}

	public static Bitmap rqCode(String name, int width, int height){
		QRCodeWriter qrCodeWriter = new QRCodeWriter();
		Map<EncodeHintType, String> hints = new HashMap<>();
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); //记得要自定义长宽
		BitMatrix encode = null;
		try {
			encode = qrCodeWriter.encode(name, BarcodeFormat.QR_CODE, width, height, hints);
		} catch (WriterException e) {
			e.printStackTrace();
		}
		int[] colors = new int[width * height];
		//利用for循环将要表示的信息写出来
		for (int i = 0; i < width; i++) {
			for (int j = 0; j < height; j++) {
				if (encode.get(i, j)) {
					colors[i * width + j] = Color.BLACK;
				} else {
					colors[i * width + j] = Color.WHITE;
				}
			}
		}

		Bitmap bit = Bitmap.createBitmap(colors, width, height, Bitmap.Config.RGB_565);
           return bit;
	}


/**
* 生成显示编码的Bitmap
* 
* @param contents
* @param width
* @param height
* @param context
* @return
*/
protected static Bitmap creatCodeBitmap(String contents, int width,
int height, Context context) {
	TextView tv = new TextView(context);
	LayoutParams layoutParams = new LayoutParams(
	LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
	tv.setLayoutParams(layoutParams);
	tv.setText(contents);
	// tv.setHeight(height);
	tv.setGravity(Gravity.CENTER_HORIZONTAL);
	tv.setWidth(width);
	tv.setDrawingCacheEnabled(true);
	tv.setTextColor(Color.BLACK);
	
	tv.setTextSize(26);
	tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
	MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
	tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());
	
	tv.buildDrawingCache();
	Bitmap bitmapCode = tv.getDrawingCache();
	return bitmapCode;
}

/**
* 将两个Bitmap合并为一
* 
* @param first
* @param second
* @param fromPoint
*            第二个Bitmap绘制的起始位置（相对于第一个Bitmap）
* @return
*/
protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,
PointF fromPoint) 
{
	if (first == null || second == null || fromPoint == null) {
		return null;
	}
	int marginW = 0;
	Bitmap newBitmap = Bitmap.createBitmap(first.getWidth() > second.getWidth() ? first.getWidth() : second.getWidth() + marginW,
	first.getHeight() + second.getHeight(), Config.ARGB_4444);
	Canvas cv = new Canvas(newBitmap);
	cv.drawBitmap(first, marginW, 0, null);
	cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);
	cv.save();
	cv.restore();
	
	return newBitmap;
}
/**
* 生成条形码
* 
* @param context
* @param contents
*            生成的内容
* @param desiredWidth
*            生成条形码的宽带
* @param desiredHeight
*            生成条形码的高度
* @param displayCode
*            是否在条形码下方显示内容
* @return
*/
public static Bitmap creatBarcode(Context context, String contents,
int desiredWidth, int desiredHeight, boolean displayCode) 
{
	Bitmap ruseltBitmap = null;
	/**
	* 图片两端的空白的宽
	*/
	int marginW = 0;
	/**
	* 条形码的编码类型
	*/
	BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;
	
	if (displayCode) {
		Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,
		desiredWidth, desiredHeight);
		Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2
		* marginW, desiredHeight, context);
		ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(
		0, desiredHeight));
	} else {
		ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,
		desiredWidth, desiredHeight);
	}

	return ruseltBitmap;
}

public static Bitmap createQRImage(String url, int QR_WIDTH, int QR_HEIGHT) {
	try {
			// 判断URL合法�?
			if (url == null || "".equals(url) || url.length() < 1) {
				return null;
			}
			Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
			
			//设置QR的纠错级别为最高H级别
			hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.H);
			hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
			// 图像数据转换，使用了矩阵转换
			BitMatrix bitMatrix = new QRCodeWriter().encode(url,
			BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
			int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
			// 下面这里按照二维码的算法，�?个生成二维码的图片，
			// 两个for循环是图片横列扫描的结果
			for (int y = 0; y < QR_HEIGHT; y++) {
				for (int x = 0; x < QR_WIDTH; x++) {
				if (bitMatrix.get(x, y)) {
					pixels[y * QR_WIDTH + x] = 0xff000000;
				} else {
					pixels[y * QR_WIDTH + x] = 0xffffffff;
				}
			}
		}
		// 生成二维码图片的格式，使用ARGB_8888
		Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
		Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);

		// 显示到一个ImageView上面
		return bitmap;
		} catch (WriterException e) {
			e.printStackTrace();
		}
		return null;
}



}
